GeoEye-1 (0.5m) satellite image (above) shows a portion of Arizona’s Grand Canyon National Park, the 15th national park in the United States. The Grand Canyon is 277 miles (446 kilometer) long, up to 18 miles (29 kilometer) wide and over a mile (6,000 feet / 1,800 meters) deep.

Recent evidence suggests the Colorado River established its course and began carving out the steep-sided canyon at least 17 million years ago. The Grand Canyon Skywalk is a horseshoe-shaped cantilever bridge perched 4,000 feet above the canyon floor and on the edge of the Grand Canyon’s West rim. It attracts almost five million visitors each year and is separately owned by the Hualapai Nation.

The satellite image was collected by the GeoEye-1 satellite on Sept. 3, 2010 while flying 423 miles above the Earth at an average speed of 17,000 mph. For more information on Grand Canyon National Park, visit here.